10. Helldivers

It's impossible to resist comparing Arrowhead Game Studios' top-down shooter to "XCOM," but this alien bug hunt is terrifying for altogether different reasons. Its difficulty is kinetic, predicated on your ability to not only shoot and think straight in clutch moments, but to do so in concert with up to three partners. Things will go wrong. Whether it's a suicide squeeze between enemy swarms, friendly fire or getting crushed by an equipment drop like some Looney Tunes character, death doesn't mean do-over, it means do-around. Thankfully, the massive galactic conquest metagame of "Helldivers" will give you plenty of chances.